Control method for a direct injection system of the...

Details Control method for a direct injection system of the... Control method for a direct injection system of the...

2008-09-23

2010-12-28

Moulis, Thomas N (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S447000

Reexamination Certificate

active

07856960

ABSTRACT:
A control method of a direct injection system of the common-rail type provided with a shut-off valve for controlling the flow rate of a high-pressure fuel pump; the control method contemplates the steps of: feeding the pressurized fuel to a common rail by means of a high-pressure pump which receives the fuel through a shut-off valve; cyclically controlling the opening and closing of the shut-off valve for choking the flow rate of fuel taken in by the high-pressure pump; adjusting the flow rate of fuel taken in by the high-pressure pump by varying the ratio between the duration of the opening time and the duration of the closing time of the shut-off valve; determining a lower limit value of the opening time of the shut-off valve; and adjusting the driving frequency of the shut-off valve so that the real opening time of the shut-off valve is always over the lower limit value.

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